The heat is on in Investigation 5, an undercover police unit specializing in thwarting violent crimes. Led by Superintendent Jang Moon Won, this team of young and elite officers, including Cha Gun Woo, Jang Min Joo, and Lee Won Jong, assume new identities and infiltrate dangerous crime syndicates. With only their wits and poker faces at their disposal, can the team complete their missions without blowing their covers in hostile territory?
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Season 1Drama Fever
S01 E01Jun 16, 2015
Episode 1 Jun 16, 2015 After his partner is killed, Gun Woo joins the elite undercover unit the Criminal Investigation Team and goes deep undercover to recover an old friend.
S01 E02Jun 16, 2015
Episode 2 Jun 16, 2015 Though Gun Woo is suspected of being a cop, the gang brings him along on a job. The Criminal Investigation Team finds Hae imprisoned by the gang, but he insists on staying to complete the mission.
S01 E03Jun 22, 2015
Episode 3 Jun 22, 2015 Min Tae In finds a way to extract himself and prove Gun Woo's loyalty. Complications ensue as as the criminals attempt to steal the hologram.
S01 E04Jun 23, 2015
Episode 4 Jun 23, 2015 Gun Woo officially joins the team and puts his investigation skills to use as they track a hacker known as the Mermaid.
S01 E05Jun 29, 2015
Episode 5 Jun 29, 2015 The team discovers a human trafficking ring and Assistant Manager Jang goes undercover, despite the risk of getting kidnapped herself.
S01 E06Jun 30, 2015
Episode 6 Jun 30, 2015 Suspicious of their success rate, the NIS hires an attorney to investigate the Team. In response, Min goes undercover in their agency and the Team tries to resolve one of their old cases.